JPH043791B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an extraction device that separates a bitumen mixture such as asphalt paving material into aggregate and bitumen components using an organic solvent.

<Prior Art> Conventionally, extraction tests on bituminous mixtures such as asphalt paving materials have been carried out by either the centrifugation method or the Soxhlet method. Among these, the centrifugation method is
After putting the bitumen mixture into the extraction container, it is injected by the organic manual control, and the centrifugal rotation motor is rotated by the manual switch, so that the bitumen dissolved in the organic solvent is filtered through the filter paper inserted between the extraction container and the container lid. The aggregate and bitumen are separated and the bitumen containing organic solvent is discharged. After the first discharge of bitumen containing organic solvent is completed, the centrifugal rotation motor is turned off using a manual switch, brought to a rapid stop using a manual brake, and new solvent is injected. The process from injecting the organic solvent to stopping using the manual brake is repeated until the bitumen content disappears from the discharged organic solvent and bitumen. This operation usually takes more than ten times.

Next, the container containing the extracted aggregate is removed from the apparatus, and the aggregate is placed in a drying oven and dried until it reaches a constant weight. This work usually takes about 3 hours. Furthermore, in parallel with the drying of the aggregate, the amount of filler contained in the discharged liquid containing the organic solvent and bitumen is quantified using a pressure filter using filter paper as the filtration medium and air pressure as the pressurizing force.

<Problems to be Solved by the Invention> However, in such conventional methods for extracting bitumen mixtures, the dissolving power to separate the aggregate and bitumen is limited to the static dissolving power of the organic solvent and forced discharge by centrifugal force. The process of injecting the solvent has to be repeated over ten times, making the operation complicated and time-consuming.

Furthermore, in the conventional centrifugal separator, since a filter paper is disposed between the extraction container and the container lid, it is impossible to avoid a small amount of filler from flowing out due to the structure, and the amount thereof is not constant. As a result, the bitumen content in the bitumen mixture cannot be calculated unless the effluent filler content is separately quantified. Pressure filtration is used to quantify the amount of filler flowing out, but it takes a considerable amount of time to quantify the amount of filler flowing out, which involves such an operation.

Furthermore, after the extraction operation is completed, it is necessary to remove the organic solvent from the separated aggregate, but conventional drying operations require a considerable amount of time. Furthermore, in the series of operations described above, there are other problems, such as the fact that workers must come into contact with organic solvents that are harmful to the human body for a long period of time.

In view of these circumstances, an object of the present invention is to provide an apparatus that can extract and separate a bitumen mixture simply, accurately, and safely in a short period of time.

<Means for Solving the Problems> To achieve the above object, the bitumen mixture extraction device of the present invention comprises a container for storing a bitumen mixture, a solvent injection device for injecting an organic solvent into the container, and the container. An apparatus for extracting a bitumen mixture comprising a motor for rotating the container, characterized in that the motor comprises an inverter motor for arbitrarily rotating the container.

The extraction device of the present invention is preferably such that the container is equipped with a metal filter on the surrounding wall, and a heating device is provided outside the container to heat the container, and the bitumen containing the extracted and separated organic solvent is It is equipped with a device to store and retrieve the amount.

The present invention will be explained below based on the drawings.

FIG. 1 is a sectional view showing an example of a bitumen mixture storage container in the apparatus of the present invention, and FIG. 2 is a schematic diagram showing an example of the entire apparatus of the present invention.

In the figure, a centrifugal container 1 is a container for storing a bituminous mixture, and is designed to be sealed by tightening a dedicated lid 2 with a tightening screw 4 via an O-ring 3. Preferably, a metal filter 5 is provided on the peripheral wall of the container 1. This metal filter is preferably a so-called laminated metal mesh filter. A filter with a filtration accuracy of about 0.5 μm is used. By using such a metal filter, the amount of filler flowing out is greatly reduced, and the operation of quantifying the amount of filler flowing out, which was previously considered essential, becomes unnecessary.

Incidentally, it is preferable that the lid 2 is also provided with a metal filter 5'.

The inverter control motor 6 rotates the centrifugal container 1 in forward and reverse directions at an arbitrary rotation speed. Conventionally, there has been no example of using an inverter-controlled motor in this type of device. The dissolution of organic solvents in the conventional centrifugal extraction method was based on a static dissolution action as described above, but by using an inverter-controlled motor, the direction of rotation of the container can be changed as appropriate to achieve a dynamic dissolution action. By using the same function, the dissolution rate of the solvent can be greatly accelerated without any adverse effects.

The organic solvent injection cylinder 7 injects solvent from an organic solvent tank 8 through a solvent discharge valve 9.
The clamp 10 protects the cylinder from wobbling during centrifugal rotation, and when the cylinder is lowered, the solvent inlet at the tip of the cylinder and the solvent inlet 11 of the centrifuge container are at the same level.

The centrifugal container 1 is provided in an extraction chamber 17 that covers it, and a bituminous organic solvent solution extracted through a metal filter is led to a recovery tank 14 through a waste liquid outlet 12.

The waste liquid discharge port 12 is for discharging the extraction waste liquid.
As mentioned above, when bitumen recovery is required, the discharge valve 1
The waste liquid is stored in the recovery tank 14 via the drain valve 3 and into the waste liquid tank 16 via the discharge valve 15 when not needed. This storage tank can also be replaced with a solvent regeneration device.

Preferably, a heat treatment 18 is provided on the back side of the extraction chamber 17, and when the organic solvent adhering to the aggregate is evaporated and separated from the aggregate left in the centrifugation container after the extraction operation is completed, the system is heated by the heating device. Heat to solvent evaporation temperature. Both can be separated in a short time by centrifugal drying on the spot. In particular, since the solvent used to extract the bituminous mixture generally has a high specific gravity, this operation further promotes the emission of organic solvent gases.

Next, the operation will be explained according to the flowchart shown in FIG.

First, the bituminous mixture is stored in the centrifugal container 1, and after fixing the special lid 2 with the tightening screw 4, the extraction chamber 1
7 in the predetermined position. When the work switch is turned on, the control timer operates according to the flowchart shown in FIG.

In S1, the first on-off valve 9 is opened to supply organic solvent from the organic solvent tank 8 to the centrifuge container 1 for a target time (usually about 2 minutes depending on the amount of internal sample). S2
Now, determine whether the target supply time has been reached,
If YES, the process proceeds to S3, where the first on-off valve 9 is closed to stop the supply of organic solvent to the centrifugal container 1, and then the process proceeds to S4. When NO, the process returns to S1 and continues supplying the organic solvent until the target supply time.

In S4, dissolution of the bitumen by low-speed centrifugal forward rotation/reverse rotation is started, and in S5, it is determined whether the target dissolution time has been reached, and if YES, the process proceeds to S6, where the centrifugal low-speed forward rotation/reverse rotation is ended, and S7 Proceed to.
If NO, the process returns to S5 and the melting rotation continues until the target melting time is reached.

Next, the presence or absence of waste liquid recovery is automatically selected using the waste liquid recovery selection switch S7 selected in advance, and if waste liquid recovery is necessary, the second on-off valve 1 is selected in S8.
3 opens, the centrifugal high-speed forward rotation is started by the inverter control motor 6 in S9, and the waste liquid is transferred to the recovery tank 1.
Saved to 4. In S10, it is determined whether the target time has been reached, and if YES, the process proceeds to S11, where the second on-off valve 13 is closed and the third on-off valve 15 is opened.
If NO, the process returns to S10 and the centrifugal high-speed forward rotation is continued until the target time is reached.

If there is no need to collect waste liquid in S7, the third
The on-off valve 15 opens, and in S13, centrifugal high-speed forward rotation is started by the inverter control motor 6, and the waste liquid is stored in the waste liquid tank 16. At this time, it is also possible to use the waste liquid tank as a solvent regeneration tank, for example, by installing a level switch in the tank, heating and regenerating the waste liquid when it reaches a certain level, and ending the regeneration when it falls below a certain level.

Next, in S14, the first on-off valve 9 is opened to supply organic solvent from the organic solvent tank 8 to the centrifugal container 1 for a target time. This target time is usually about 6 to 8 minutes. In S15, it is determined whether the target supply time has been reached, and if YES, the process proceeds to S16 and the first on-off valve 9 is closed. If NO, the process returns to S14 and continues supplying the organic solvent until the target supply time.

Next, in S17, it is determined whether or not the target extraction rotation time has been reached, and if YES, the process proceeds to S18 to end the centrifugal high-speed rotation, and in S19, the third on-off valve is closed. The target extraction rotation time here is usually about 2 minutes, which is the sum of the first solvent injection time, the dissolution time, the second solvent injection time, and the shake-off time. If NO, the process returns to S9 and S17, respectively, and the rotation continues until the target extraction rotation time.

Next, in S20, the centrifugal medium-speed forward rotation is started to accelerate the drying of the extracted aggregate, and in S21, the heating device 1
Aggregate drying by 8 is started and the second start valve 13 is opened. In S22, it is determined whether the target drying time has been reached, and if YES, the process proceeds to S23, where drying heating and centrifugal medium speed forward rotation are completed. Target drying time is usually
It takes about 20 to 40 minutes and varies depending on the particle size of the mixture. When NO, the process returns to S21 and continues heating until the target drying time.

In addition, as shown in Fig. 5, multiple centrifuge containers are
It is also possible to connect to the storage number system.

<Effects of the Invention> By using the apparatus of the present invention, the separation and independence of the aggregate and bitumen components of the bituminous mixture is promoted, and in a preferred embodiment, the drying of the aggregate and the miniaturization of the amount of filler flowing out are also promoted. As a result, the bitumen content of the bitumen mixture can be calculated in a short time, and a recovered waste liquid for physical properties of the bitumen can be obtained at the same time, and furthermore, contact with organic solvents, which are known to have an adverse effect on the human body, can be avoided. Additionally, these controls are automatic, resulting in significant labor savings.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing an example of a centrifugal container of the present invention, FIG. 2 is a schematic view showing an example of the entire device, FIG. 3 is a flow chart, FIG. 4 is a time chart, and FIG. FIG. 5 is a schematic diagram showing another example of the overall device. 1...Centrifuge container, 5...Special metal filter,
6... Inverter control motor, 14... Recovery tank, 16... Waste liquid tank, 18... Heating device.

Claims (1)

[Scope of Claims] 1. A bitumen mixture extraction device comprising a container for storing a bitumen mixture, a solvent injection device for injecting an organic solvent into the container, and a motor for rotating the container, wherein the motor An apparatus for extracting a bitumen mixture, characterized by comprising an inverter motor that rotates a container arbitrarily. 2. A bituminous mixture extraction device comprising a container for storing a bitumen mixture, a solvent injection device for injecting an organic solvent into the container, and a motor for rotating the container, the motor including an inverter for arbitrarily rotating the container. An apparatus for extracting a bituminous mixture, comprising a motor and a container having a metal filter on the peripheral wall. 3. A bituminous mixture extraction device comprising a container for storing a bitumen mixture, a solvent injection device for injecting an organic solvent into the container, and a motor for rotating the container, the motor comprising an inverter for arbitrarily rotating the container. comprising a motor, the container is equipped with a metal filter on the surrounding wall, and a heating device for heating the container is provided outside the container,
and a bitumen mixture extraction device comprising a device for storing and recovering the bitumen component containing the extracted and separated organic solvent.